21211222111000 has 128 divisors (see below), whose sum is σ = 50137820328960. Its totient is φ = 8398825200000.

The previous prime is 21211222110983. The next prime is 21211222111067. The reversal of 21211222111000 is 11122211212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40653777 + ... + 41172223.

It is an arithmetic number, because the mean of its divisors is an integer number (391701721320).

Almost surely, 2^{21211222111000} is an apocalyptic number.

21211222111000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21211222111000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25068910164480).

21211222111000 is an abundant number, since it is smaller than the sum of its proper divisors (28926598217960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211222111000 is a wasteful number, since it uses less digits than its factorization.

21211222111000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518882 (or 518868 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21211222111000 its reverse (11122211212), we get a palindrome (21222344322212).

The spelling of 21211222111000 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred eleven thousand".